add license/readme

LICENSE

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+MIT License
+
+Copyright (c) 2023 Emil Lerch
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+Xuantie GNU Toolchain Docker Image
+==================================
+
+This dockerfile will build the image based on the default branch of
+https://github.com/T-head-Semi/xuantie-gnu-toolchain
+
+There is a completed docker image you can pull
+
+`docker pull git.lerch.org/lobo/xuantie-gnu-toolchain:b181cea`
+
+As of b181cea, it appears no T-Head proprietary binaries are involved with the
+build process
+
+This takes 1hr 9min on a 16 core Intel(R) Xeon(R) Platinum 8375C CPU @ 2.90GHz.
+Recommend at least 16GB RAM to build.
+
+The image is based on debian bookworm, which is still in testing at the time
+of writing. The image also adds cmake to this toolkit. This allows for
+downstream usage of [Bouffalo Lab SDK](https://github.com/bouffalolab/bouffalo_sdk/)
+which requires a fairly modern version of cmake.